Neutrino trapping in extremely compact Tolman VII spacetimes

Abstract

Extremely compact objects trap gravitational waves or neutrinos, assumed to move along null geodesics in the trapping regions. The trapping of neutrinos was extensively studied for spherically symmetric extremely compact objects constructed under the simplest approximation of the uniform energy density distribution, with radius located under the photosphere of the external spacetime; in addition, uniform emissivity distribution of neutrinos was assumed in these studies. Here we extend the studies of the neutrino trapping for the case of the extremely compact Tolman VII objects representing the simplest generalization of the internal Schwarzschild solution with uniform distribution of the energy density, and the correspondingly related distribution of the neutrino emissivity that is thus again proportional to the energy density; radius of such extremely compact objects can overcome the photosphere of the external Schwarzschild spacetime. In dependence on the parameters of the Tolman VII spacetimes, we determine the "local" and "global" coefficients of efficiency of the trapping and demonstrate that the role of the trapping is significantly stronger than in the internal Schwarzschild spacetimes. Our results indicate possible influence of the neutrino trapping in cooling of neutron stars.

13 pages, 9 figures. To appear in EPJC

References in corpus (7)

• Are eikonal quasinormal modes linked to the unstable circular null geodesics?
• General relativistic polytropes with a repulsive cosmological constant
• Relaxations of perturbations of spacetimes in general relativity coupled to nonlinear electrodynamics
• Polytropic spheres containing regions of trapped null geodesics
• Dynamical instability of polytropic spheres in spacetimes with a cosmological constant
• Upper bound on the radii of regular ultra-compact star photonspheres
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Cited by in corpus (6)

• Extended Tolman III and VII solutions in $f(\mathcal{R},T)$ gravity: Models for neutron stars and supermassive stars
• New interior model of neutron stars
• Slowly rotating Tolman VII solution
• Horizonless star based on regular black hole with finite radius and its observational signatures
• The Tolman VII Space-time in the Presence of a Charge and a Cosmological Constant
• Static Charged Polytropic Spheres with a Cosmological Constant: Physical Acceptability and Trapped Orbits